Molecular gas conditions in NGC 4945 and the Circinus galaxy S. J. Curran, L. E. B. Johansson, P. Bergman, A. Heikkilä and S. Aalto A&A, 367 2 (2001) 457-469 Published online: 15 February 2001 DOI: 10.1051/0004-6361:20000462